Noise - EPA Protective Levels

The noise level should not exceed certain values to protect public health and welfare according to EPA guidelines for Ldn (Day-Night Sound Levels) and Leq (Equivalent Sound Level).

EffectLevelAreaType
HearingLeq(24) < 70 dBAAll areasHearing protection
Outdoor activity interference and annoyanceLeq < 55 dBAOutdoors in residential areas and farmsOutdoor activity
Outdoor activity interference and annoyanceLeq(24) < 55 dBAOutdoor areas (school yards, playgrounds, etc.)Outdoor activity
Indoor activity interference and annoyanceLeq < 45 dBAIndoor residential areasIndoor activity
Indoor activity interference and annoyanceLeq(24) < 45 dBAIndoor areas (schools, etc.)Indoor activity
Public health and welfareLdn < 55 dBOutdoor sensitive areas (residences, schools, hospitals)Yearly Ldn outdoor
Public health and welfareLdn < 45 dBInside buildingsYearly Ldn indoor